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Study recommended for dan players.
(Show more of this level)
Here black chooses to play the left side. Now, white must immediatly play at the top to solidify his position. However, if black plays the top side first (as in the main diagram), then to keep the game even white must immediatly play the left side. If not, then he ends up giving away 2 times, which is the case in the main diagram. It is too soft.